os: implement ReadWriteLock

libraries/libstratosphere/source/os/impl/os_tick_manager.hpp

@@ -27,4 +27,8 @@ namespace ams::os::impl {
         return GetTickManager().GetTick();
     }
 
+    ALWAYS_INLINE Tick GetCurrentTickOrdered() {
+        return GetTickManager().GetSystemTickOrdered();
+    }
+
 }